My brand new LM4c. She's pretty rudimentary right now but i have big plans for her. Already did the buffer spring (noise) mod (thank you akiraspeedstar) and thanks to the advice here, i was able to remove the std flashider with some blow drying and a wrench. Things i still have to do are get up the courage to remove the barrel nut, get the upper re-threaded to fit RS rails, and that should be about it as far as the gun itself. I definitely underestimated the weight of this system, it feels very solid. My brother has a KA M4 GBBR built as a SOPMOD Block II and fully loaded that weighs about the same as this with whats on it now.